Question: Who is the {historical country} for {shares border with} of {Roman Empire}
Paraphrase: Who is the {chronicled nation} for {offers border with} of {Roman Empire}
SPARQL (Wikidata):  select distinct ?obj where { wd:Q2277 wdt:P47 ?obj . ?obj wdt:P31 wd:Q3024240 } 
Answer: Parthian Empire